The Great Gatsby is told from the point of view of Nick Carroway. He is from the Midwest, but narrates the story after it takes place in the East. As such, he is an outsider, and tends to judge what he experiences in the East based on his midwestern ideas and values.
Nick makes an effort to assure the reader that he is nonjudgmental and completely honest. This is ironic, because he is very judgmental and opinionated. He is an unreliable narrator.
Nick, in the process of telling the reader Gatsby's story, reveals the underbelly of the Jazz Age and the American Dream, the impossibility of recapturing the past, the tendency for humans to try to recapture the past, the difference between illusion and reality.
This novel is told from the point of view of one of the characters. In other words, it is not told from the point of view of a third person narrator. The narrator interacts with the other characters and can not see inside their minds or anything.
The name of the character who narrates the novel is Nick Carraway. He is a young man, about thirty, who is from the Midwest. He went to Yale for college and has now moved to the New York area. He is working in the business of selling bonds.